// Copyright (c) 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef GPU_COMMAND_BUFFER_COMMON_VALUE_STATE_H_
#define GPU_COMMAND_BUFFER_COMMON_VALUE_STATE_H_

#include "base/containers/hash_tables.h"
#include "base/memory/ref_counted.h"
#include "gpu/gpu_export.h"

namespace gpu {

// Used to maintain Valuebuffer state, exposed to browser to
// support passing ValueStates via IPC.
union GPU_EXPORT ValueState {
    float float_value[4];
    int int_value[4];
};

// Refcounted wrapper for a hash_map of subscription targets to ValueStates
class GPU_EXPORT ValueStateMap : public base::RefCounted<ValueStateMap> {
public:
    ValueStateMap();

    // Returns NULL if there is not ValueState for the target
    const ValueState* GetState(unsigned int target) const;

    void UpdateState(unsigned int target, const ValueState& state);

protected:
    virtual ~ValueStateMap();

private:
    friend class base::RefCounted<ValueStateMap>;

    typedef base::hash_map<unsigned int, ValueState> Map;

    Map state_map_;

    DISALLOW_COPY_AND_ASSIGN(ValueStateMap);
};

} // namespace gpu

#endif // GPU_COMMAND_BUFFER_COMMON_VALUE_STATE_H_
